CWNP Certified wireless analusis professional(cwap) Sample Questions:

1. ABC Corp has just installed a single 802.11b access point into their medium-sized office environment. As the wireless LAN administrator at ABC Corp, you use a wireless protocol analyzer to troubleshoot the problem. You place your analyzer close to the access point, and capture some traffic from office users. Given the screenshot shown, which of the following statements offer the best explanation for the poor wireless LAN performance of ABC's new 802.11b wireless LAN?

A) Due to an 802.11g client joining the BSS, protection mechanisms have been enabled in the BSS by the access point. These protection mechanisms greatly increase protocol overhead, thereby decreasing overall wireless LAN throughput.
B) There is likely a source of RF interference somewhere around the access point. This is causing many data frames to be retransmitted, so overall wireless LAN throughput has been greatly diminished.
C) A nearby 802.11b access point is operating on an adjacent channel causing a significant amount of corrupt frames within ABC's BSS. These corrupt frame fragments are congesting the channel on which ABC's wireless LAN is operating, thereby decreasing its throughput.
D) One of the wireless LAN users has moved far enough away from the access point that his client station has begun transmitting frames at the minimum supported data rate. Even when a single user uses this rate for Data frames, throughput for the entire wireless LAN as a whole is slowed significantly.

2. A wireless LAN protocol analyzer utilizing a radio card compliant with IEEE 802.11a,
802.11b, and 802.11g standards will be able to perform which of the following tasks?

A) Recognize and decode all 802.11g frames regardless of the modulation used at the physical layer.
B) Recognize and decode all protection mechanisms sent by a transmitter using CCK.
C) Recognize and decode transmissions from 900 MHz Pre-DSSS system in order to report an intrusion to a centralized security console.
D) Recognize and decode 802.11-compliant FHSS access point transmissions in the 2.4 GHz ISM band.
E) Recognize, decrypt, and decode unicast data frames encrypted with WPA-compliant
802.1X/EAP between stations and access points when an appropriate username and password combination is entered into the analyzer software.
F) Recognize and decode 802.11a, 802.11b, and 802.11g transmissions simultaneously.

3. While operating in DCF mode, stations and access points must use a backoff algorithm in order to arbitrate for medium access. During what specific period of time is the backoff timer decremented?

A) During the Contention Window
B) During the Defer Window
C) During a DCF Interframe Space
D) During the Contention-free Period
E) During any part of the Superframe

4. Choose the correct pairing of IEEE 802.11 standards with their specification of supported preamble lengths.

A) 802.11 -long preamble support mandatory, short preambles not supported
B) 802.11b -long preamble support mandatory, short preamble support optional
C) 802.11g -long preamble support mandatory, short preamble support mandatory
D) 802.11a -long preamble support mandatory, short preamble support mandatory
E) 802.11b -long preamble support mandatory, short preamble support mandatory

5. Shown is a screenshot of a wireless protocol analyzer displaying the decode information for a single 802.11 encrypted data + CF-Poll frame. The network on which this information was captured was operating in DCF mode using WEP, and this particular frame was sent from a client station (STA) to an access point (AP). As a protocol analyst, how would you explain the existence of this frame on the wireless medium given the information in the decode?

A) The frame was sent by a client station that does not comply with IEEE 802.11b standard to an access point that is certified.
B) The frame was misinterpreted based on insufficient information received by the analyzer due to frame corruption.
C) The 802.11 network is using both version 1 and version 2 protocols simultaneously.
This unexpected frame is from the version 2 protocol set.
D) The access point is operating as a repeater, and clients must poll repeater access points in order to transmit data frames through them.

Solutions: